I got 51 marks in jee and i expected to 12 board 75 %. so is it possible to get addmission in nit or any other best colleges

No, it may not be possible. But you can surely try for any good college near an industrial city.

Hi Dilshad, -with 51 marks its not possible to get any NIT or best colleges through jee main counselling. Try to get admission on the basis of your 12th marks or through any other entrance exam. Various reputed private universities offers direct admission on the basis of your 12th marks few of the